Pixel circuit, driving method thereof, and display device

Abstract

The invention discloses a pixel circuit, a driving method thereof, and a display device, and belongs to the technical field of display. The pixel circuit includes a compensation sub-circuit, a regulation sub-circuit, and a detection sub-circuit. Since the compensation sub-circuit can output a first power signal to a first node, the adjustment sub-circuit can adjust the potential of a second node according to the potential of the first node. Therefore, a drive current outputted to a light-emitting unit can be enabled to be independent of a threshold voltage of a driving transistor, i.e., achieving the internal compensation of the threshold voltage of the drive transistor. Since the detection sub-circuit can output the potential of the second node to a detection signal line connected to an external compensation circuit, the external compensation circuit can adjust the data signal voltage according to the voltage of the light-emitting unit, i.e., achieving external compensation of the threshold voltage of the driving transistor. The problem that the difference of the driving currents flowing through the respective light-emitting units due to the threshold voltage of the driving transistor causes the non-uniform display brightness of a display device is solved.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a pixel circuit, a driving method thereof, and a display device. Background technique [0002] Active matrix organic light emitting diode (AMOLED), as a current-mode light-emitting device, has become more and more popular due to its characteristics of self-luminescence, fast response, wide viewing angle and the ability to be fabricated on flexible substrates. It is widely used in the field of high-performance display. [0003] In an AMOLED display device, each pixel unit includes an AMOLED and a pixel circuit, and the pixel circuit can provide a driving current to the AMOLED to drive the AMOLED to emit light. The pixel circuit generally includes: a driving transistor, a switching transistor and a capacitor. The switching transistor can output the data voltage provided by the data signal terminal to the driving transistor, and the driving transistor can convert the data...

Images